Inclusion of the zero-sequence mutual impedance in a distributed parameter model of transmission lines

Abstract

This article presents a method for the inclusion of the zero-sequence mutual impedance in a distributed parameter model of transmission lines. An analytical deduction of the line constants was developed for the single-phase case of magnetically coupled circuits, and these constants were used in the line model with symmetrical components. The method was tested with the measurements from fault records. First, the phasors are computed from the recorded waveforms, and then the sequence components are calculated. The record from one line end is used to compute the theoretical values of the remote line end, and these computed values are compared with the record of the remote line end. The results without the effect of the zero-sequence mutual impedance are also computed in order to show the differences.